Codes-The Guide to Secrecy from Ancient to Modern Times

This book has been written with a broad spectrum of readers in mind, which includes anyone interested in secrecy and related issues. Thus, this is a tome for the merely curious, as well as history-minded readers, amateur mathematicians, engineers, bankers, academics, students, those practitioners working in cryptography, specialists in the field, and instructors wanting to use the book for a text in a course on a variety of topics related to codes. We will look at this topic from all aspects including not only those related to cryptography (the study of methods for sending messages in secret), but also the notion of codes as removal of noise from telephone channels, satellite signals, CDs and the like. The uninitiated reader may consider the following. Imagine a world where you can send a secret message to someone, and describe to anyone listening in precise detail how you disguised the message. Yet that person could not remove the disguise from that message no matter how much time or how many resources are available. Well, that world exists in the here and now, and the methodology is called public-key cryptography. It permeates our lives, from the use of a bank card at an automated teller machine ATM to the buying of items or bank transactions over the Internet. You can even purchase items over the Internet and do so anonymously, as you would using hard cash. In this book, you will find out how this is done.

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